CS51021A
CS51021A, CS51022A, CS51023A, CS51024A
Enhanced Current Mode
PWM Controller
The CS51021A/2A/3A/4A Fixed Frequency PWM Current Mode Controller family provides all necessary features required for AC±DC or DC±DC primary side control. Several features are included eliminating the additional components needed to implement them externally. In addition to low start±up current (75 μA) and high frequency operation capability, the CS51021A/2A/3A/4A family includes overvoltage and undervoltage monitoring, externally programmable dual threshold overcurrent protection, current sense leading edge blanking, current slope compensation, accurate duty cycle control and an externally available 5.0 V reference. The CS51021A and CS51023A feature bidirectional synchronization capability, while the CS51022A and CS51024A offer a sleep mode with 100 μA maximum IC current consumption. The CS51021A/2A/3A/4A family is available in a 16 lead narrow body SO package.
Device |
Sleep/Synch |
VCC Start/Stop |
CS51021A |
Synch |
8.25 V/7.7 V |
|
|
|
CS51022A |
Sleep |
8.25 V/7.7 V |
|
|
|
CS51023A |
Synch |
13 V/7.7 V |
|
|
|
CS51024A |
Sleep |
13 V/7.7 V |
|
|
|
Features
•75 μA Max. Startup Current
•Fixed Frequency Current Mode Control
•1.0 MHz Switching Frequency
•Undervoltage Protection Monitor
•Overvoltage Protection Monitor with Programmable Hysteresis
•Programmable Dual Threshold Overcurrent Protection with Delayed Restart
•Programmable Soft Start
•Accurate Maximum Duty Cycle Limit
•Programmable Slope Compensation
•Leading Edge Current Sense Blanking
•1.0 A Sink/Source Gate Drive
•Bidirectional Synchronization (CS51021A/3A)
•50 ns PWM Propagation Delay
•100 μA Max Sleep Current (CS51022A/4A)
|
http://onsemi.com |
|
SO±16 |
16 |
D SUFFIX |
CASE 751B |
|
|
1 |
PIN CONNECTIONS AND
MARKING DIAGRAM
GATE |
1 |
|
|
16 |
VC |
|||
|
|
|||||||
|
|
|
|
|
|
|
||
|
|
|
|
|
|
|
||
ISENSE |
|
|
AWLYWW |
CS5102xA |
|
|
|
PGND |
|
|
|
|
|
||||
SLEEP or SYNC |
|
|
|
|
|
VCC |
||
|
|
|
|
|
|
|
||
SLOPE |
|
|
|
|
|
|
|
VREF |
|
|
|
|
|
|
|
||
UV |
|
|
|
|
|
|
|
LGND |
|
|
|
|
|
|
|
||
OV |
|
|
|
|
|
|
|
SS |
|
|
|
|
|
|
|
||
RTCT |
|
|
|
|
|
|
|
COMP |
|
|
|
|
|
|
|
||
ISET |
|
|
|
|
|
|
|
VFB |
|
|
|
|
|
|
|
||
x |
|
= Specific Device Code |
||||||
A |
|
= Assembly Location |
||||||
WL, L = Wafer Lot |
|
|||||||
YY, Y |
|
= Year |
|
|
|
|
|
|
WW, W = Work Week |
|
ORDERING INFORMATION*
Device |
Package |
Shipping |
|
|
|
CS51021AED16 |
SO±16 |
48 Units/Rail |
|
|
|
CS51021AEDR16 |
SO±16 |
2500 Tape & Reel |
|
|
|
CS51022AED16 |
SO±16 |
48 Units/Rail |
|
|
|
CS51022AEDR16 |
SO±16 |
2500 Tape & Reel |
|
|
|
CS51023AED16 |
SO±16 |
48 Units/Rail |
|
|
|
CS51023AEDR16 |
SO±16 |
2500 Tape & Reel |
|
|
|
CS51024AED16 |
SO±16 |
48 Units/Rail |
|
|
|
CS51024AEDR16 |
SO±16 |
2500 Tape & Reel |
|
|
|
* Consult your local sales representative for other package options.
Semiconductor Components Industries, LLC, 2001 |
1 |
Publication Order Number: |
September, 2001 ± Rev. 5 |
|
CS51021A/D |
|
|
CS51021A, CS51022A, CS51023A, CS51024A |
|
|
||||||||
|
|
|
|
|
|
100 |
|
|
|
|
|
|
VIN |
|
|
|
|
|
|
|
|
|
|
|
|
(36 V to 72 V) |
|
|
|
|
|
|
|
|
|
|
|
|
PGND |
51 k |
|
|
|
BAS21 |
1.0 μF |
|
|
|
|
|
|
SYNC/SLEEP |
|
22 μF |
|
18 V |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
11 V |
|
|
|
|
|
|
|
|
100:1 |
|
|
|
|
FZT688 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
200 k, |
|
|
|
|
|
2:5 |
|
|
|
|
|
|
|
|
|
|
|
|
||
|
|
|
|
|
24.3 k, |
1.0% |
|
10 k |
4:1 |
|
|
|
|
|
|
10 |
|
|
|
|
|
|
|||
|
|
|
|
1.0% |
|
|
|
|
|
VOUT |
||
|
|
|
|
|
|
|
|
|
|
|||
0.01 μF |
4700 pF |
|
|
|
|
|
|
|
|
|
|
|
VC |
|
VCC |
|
2.49 k, |
|
|
|
10 |
|
(5 V/5 A) |
||
|
|
|
|
|
|
|
|
|
||||
|
22 k |
VREF |
CS51021A/2A |
UV |
|
1.0% |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||||
10 k |
51 k |
COMP |
OV |
|
|
BA521 |
|
|
|
|
|
|
|
|
VFB |
|
ISET |
|
|
|
|
|
100 μF |
100 μF |
|
|
|
|
|
|
|
|
|
680 pF |
||||
|
|
RTCT |
|
SLOPE |
|
IRF6345 |
|
|
|
|
||
|
|
|
|
|
|
|
|
SGND |
||||
|
|
SYNC/ |
|
GATE |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
|
|
SLEEP |
|
ISENSE |
6.98 k, |
6.98 k, |
100 |
|
|
|
|
|
330 pF |
|
CSS |
|
PGND |
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|||||
|
|
LGND |
|
|
1.0% |
1.0% |
|
62 |
|
|
|
|
|
0.01 μF |
|
|
|
470 pF |
|
100 p |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
0.1 μF |
5.1 k |
|
|
|
|
|
|
|
|
|
|
TL431 |
|
|
|
|
|
|
|
|
|
|
180 |
|
|
|
1000 pF |
2.0 k, 1.0% |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1.0 k |
2.0 k, |
|
|
|
|
|
|
|
|
|
|
|
1.0% |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10 K |
|
|
|
MOC81025 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1.0 K |
|
|
|
|
|
|
|
Figure 1. Typical Application Diagram, 36±72 V to 5.0 V, 5.0 A DC±DC Converter
MAXIMUM RATINGS*
|
Rating |
Value |
Unit |
|
|
|
|
Power Supply Voltage, VCC |
|
±0.3, 20 |
V |
|
|
|
|
Driver Supply Voltage, VC |
|
±0.3, 20 |
V |
|
|
|
|
SYNC, SLEEP, RTCT, SOFT START, VFB, SLOPE, ISENSE, UV, OV, ISET (Logic Pins) |
0.25 to VREF |
V |
|
|
|
|
|
Peak GATE Output Current |
|
1.0 |
A |
|
|
|
|
Steady State Output Current |
|
±0.2 |
A |
|
|
|
|
Operating Junction Temperature, TJ |
|
150 |
°C |
|
|
|
|
Storage Temperature Range, TS |
|
±65 to +150 |
°C |
|
|
|
|
ESD (Human Body Model) |
|
2.0 |
kV |
|
|
|
|
Lead Temperature Soldering: |
Reflow: (SMD styles only) (Note 1) |
230 peak |
°C |
|
|
|
|
1. 60 second maximum above 183°C.
*The maximum package power dissipation must be observed.
http://onsemi.com
2
CS51021A, CS51022A, CS51023A, CS51024A
ELECTRICAL CHARACTERISTICS (Unless otherwise stated, specifications apply for ±40°C < TA < 85°C, ±40°C < TJ < 150°C, 3.0 V < VC < 20 V, 8.2 V < VCC < 20 V, RT = 12 kW, CT = 390 pF)
Characteristic |
Test Conditions |
Min |
Typ |
Max |
Unit |
|
|
|
|
|
|
Under Voltage Lockout |
|
|
|
|
|
|
|
|
|
|
|
START Threshold (CS51021A/2A) |
± |
7.95 |
8.25 |
8.8 |
V |
|
|
|
|
|
|
START Threshold (CS51023A/4A) |
± |
12.4 |
13 |
13.4 |
V |
|
|
|
|
|
|
STOP Threshold |
± |
7.4 |
7.7 |
8.2 |
V |
|
|
|
|
|
|
Hysteresis (CS51021A/2A) |
± |
0.50 |
0.75 |
1.00 |
V |
|
|
|
|
|
|
Hysteresis (CS51023A/4A) |
± |
4.0 |
5.0 |
6.0 |
V |
|
|
|
|
|
|
ICC @ Startup (CS51021A/2A) |
VCC < UVSTART Threshold |
± |
40 |
75 |
mA |
|
|
|
|
|
|
ICC @ Startup (CS51023A/4A) |
VCC < UVSTART Threshold |
± |
45 |
75 |
mA |
|
|
|
|
|
|
ICC Operating (CS51021A/3A) |
± |
± |
7.0 |
9.0 |
mA |
|
|
|
|
|
|
ICC Operating (CS51022A/4A) |
± |
± |
6.0 |
8.0 |
mA |
|
|
|
|
|
|
ICC Operating |
Includes 1.0 nF Load |
± |
7.0 |
12 |
mA |
Voltage Reference |
|
|
|
|
|
|
|
|
|
|
|
Initial Accuracy |
TA = 25°C, IREF = 2.0 mA, VCC = 14 V, Note 2 |
4.95 |
5.0 |
5.05 |
V |
|
|
|
|
|
|
Total Accuracy |
1.0 mA < IREF < 10 mA |
4.9 |
5.0 |
5.15 |
V |
|
|
|
|
|
|
Line Regulation |
8.2 V < VCC < 18 V, IREF = 2.0 mA |
± |
6.0 |
20 |
mV |
|
|
|
|
|
|
Load Regulation |
1.0 mA < IREF < 10 mA |
± |
6.0 |
15 |
mV |
|
|
|
|
|
|
NOISE Voltage |
Note 2 |
± |
50 |
± |
mV |
|
|
|
|
|
|
OP Life Shift |
T = 1000 Hours, Note 2 |
± |
4.0 |
20 |
mV |
|
|
|
|
|
|
FAULT Voltage |
Force VREF |
0.90 × VREF |
0.93 × VREF |
0.95 × VREF |
V |
|
|
|
|
|
|
OK Voltage |
Force VREF |
0.94 × VREF |
0.96 × VREF |
0.985 × VREF |
V |
|
|
|
|
|
|
OK Hysteresis |
Force VREF |
75 |
165 |
250 |
mV |
|
|
|
|
|
|
Current Limit |
Force VREF |
±20 |
± |
± |
mA |
|
|
|
|
|
|
Error Amplifier |
|
|
|
|
|
|
|
|
|
|
|
Initial Accuracy |
TA = 25°C, IREF = 2.0 mA, VCC = 14 V, |
2.465 |
2.515 |
2.565 |
V |
|
VFB = COMP, Note 2 |
|
|
|
|
Reference Voltage |
VFB = COMP |
2.440 |
2.515 |
2.590 |
V |
|
|
|
|
|
|
VFB Leakage Current |
VFB = 0 V |
± |
±0.2 |
±2.0 |
mA |
|
|
|
|
|
|
Open Loop Gain |
1.4 V < COMP < 4.0 V, Note 2 |
60 |
90 |
± |
dB |
|
|
|
|
|
|
Unity Gain Bandwidth |
Note 2 |
1.5 |
2.5 |
± |
MHz |
|
|
|
|
|
|
COMP Sink Current |
COMP = 1.5 V, VFB = 2.7 V |
2.0 |
6.0 |
± |
mA |
|
|
|
|
|
|
COMP Source Current |
COMP = 1.5 V, VFB = 2.3 V |
±0.2 |
±0.5 |
± |
mA |
|
|
|
|
|
|
COMP High Voltage |
VFB = 2.3 V |
4.35 |
4.8 |
5.0 |
V |
|
|
|
|
|
|
COMP Low Voltage |
VFB = 2.7 V |
0.4 |
0.8 |
1.2 |
V |
|
|
|
|
|
|
PS Ripple Rejection |
FREQ = 120 Hz, Note 2 |
60 |
85 |
± |
dB |
|
|
|
|
|
|
SS Clamp, VCOMP |
VSS = 2.5 V, VFB = 0 V, ISET = 2.0 V |
2.4 |
2.5 |
2.6 |
V |
|
|
|
|
|
|
ILIM(SET) Clamp |
Note 2 |
0.95 |
1.0 |
1.15 |
V |
2. Guaranteed by design, not 100% tested in production.
http://onsemi.com
3
CS51021A, CS51022A, CS51023A, CS51024A
ELECTRICAL CHARACTERISTICS (continued) (Unless otherwise stated, specifications apply for ±40°C < TA < 85°C, ±40°C < TJ < 150°C, 3.0 V < VC < 20 V, 8.2 V < VCC < 20 V, RT = 12 kΩ, CT = 390 pF)
Characteristic |
Test Conditions |
Min |
Typ |
Max |
Unit |
|
|
|
|
|
|
Oscillator |
|
|
|
|
|
|
|
|
|
|
|
Accuracy |
RT = 12 k, CT = 390 pF |
230 |
255 |
280 |
kHz |
|
|
|
|
|
|
Voltage Stability |
Delta Frequency 8.2 V < VCC < 20 V |
± |
2.0 |
3.0 |
% |
|
|
|
|
|
|
Temperature Stability |
TMIN < TA < TMAX, Note 3 |
± |
8.0 |
± |
% |
|
|
|
|
|
|
Min Charge & Discharge Time |
Note 3 |
0.333 |
± |
± |
μs |
|
|
|
|
|
|
Duty Cycle Accuracy |
RT = 12 k, CT = 390 pF |
70 |
77 |
83 |
% |
|
|
|
|
|
|
Peak Voltage |
Note 3 |
± |
3.0 |
± |
V |
|
|
|
|
|
|
Valley Voltage |
Note 3 |
± |
1.5 |
± |
V |
|
|
|
|
|
|
Valley Clamp Voltage |
10 k Resistor to ground on RTCT |
1.2 |
1.4 |
1.6 |
V |
|
|
|
|
|
|
Discharge Current |
± |
0.8 |
1.0 |
1.2 |
mA |
|
|
|
|
|
|
Discharge Current |
TA = 25°C, Note 3 |
0.925 |
1.0 |
1.075 |
mA |
|
|
|
|
|
|
Synchronization (CS51021A/3A) |
|
|
|
|
|
|
|
|
|
|
|
Input Threshold |
± |
1.0 |
1.5 |
2.7 |
V |
|
|
|
|
|
|
Output Pulsewidth |
± |
160 |
260 |
400 |
ns |
|
|
|
|
|
|
Output High Voltage |
ISYNC = 100 μA |
3.5 |
4.3 |
4.8 |
V |
|
|
|
|
|
|
Input Resistance |
Note 3 |
35 |
70 |
140 |
kΩ |
|
|
|
|
|
|
Drive Delay |
SYNC to GATE RESET |
80 |
120 |
150 |
ns |
|
|
|
|
|
|
Output Drive Current |
1.0 k Load |
1.25 |
2.0 |
3.5 |
mA |
|
|
|
|
|
|
SLEEP (CS51022A/4A) |
|
|
|
|
|
|
|
|
|
|
|
SLEEP Input Threshold |
Active High |
1.0 |
1.5 |
2.7 |
V |
|
|
|
|
|
|
SLEEP Input Current |
VSLEEP = 4.0 V |
11 |
25 |
46 |
μA |
|
|
|
|
|
|
ICC @ SLEEP |
VCC ≤ 15 V |
± |
50 |
100 |
μA |
|
|
|
|
|
|
GATE Driver |
|
|
|
|
|
|
|
|
|
|
|
HIGH Voltage |
Measure VC ± GATE, VC = 10 V, 150 mA Load |
± |
1.5 |
2.2 |
V |
|
|
|
|
|
|
LOW Voltage |
Measure GATE ± PGND, 150 mA SINK |
± |
1.2 |
1.5 |
V |
|
|
|
|
|
|
HIGH Voltage Clamp |
VC = 20 V, 1.0 nF |
11 |
13.5 |
16 |
V |
|
|
|
|
|
|
LOW Voltage Clamp |
Measured at 10 mA Output Current |
± |
0.6 |
0.8 |
V |
|
|
|
|
|
|
Peak Current |
VC = 20 V, 1.0 nF, Note 3 |
± |
1.0 |
± |
A |
|
|
|
|
|
|
UVL Leakage |
VC = 20 V measured at 0 V |
± |
±1.0 |
±50 |
μA |
|
|
|
|
|
|
RISE Time |
Load = 1.0 nF, 1.0 V < GATE < 9.0 V, |
± |
60 |
100 |
ns |
|
VC = 20 V, TA = 25°C |
|
|
|
|
FALL Time |
Load = 1.0 nF, 9.0 V > GATE > 1 .0 V, |
± |
15 |
40 |
ns |
|
VC = 20 V |
|
|
|
|
SLOPE Compensation |
|
|
|
|
|
|
|
|
|
|
|
Charge Current |
SLOPE = 2.0 V |
±63 |
±53 |
±43 |
μA |
|
|
|
|
|
|
COMP Gain |
Fraction of slope voltage added to ISENSE, |
0.095 |
0.100 |
0.105 |
V/V |
|
Note 3 |
|
|
|
|
|
|
|
|
|
|
Discharge Voltage |
SYNC = 0 V |
± |
0.1 |
0.2 |
V |
|
|
|
|
|
|
3. Guaranteed by design, not 100% tested in production.
http://onsemi.com
4